enhance(report): add runner.log_report_level for the uploaded runner messages (#1310)

The runner's own messages between steps (not step output) were uploaded to the job log at `log.level`, so raising `log.level` for local debugging also changed what workflow authors see in Gitea, and lowering it hid messages from them.

Add `runner.log_report_level` to set that independently. Unset, it still follows `log.level`, so existing setups behave as before. An invalid value is rejected when the config loads.

Assisted-by: Codet
Assisted-by: Claude Code:claude-opus-5-5
Co-authored-by: silverwind <[email protected]>
Co-authored-by: silverwind <[email protected]>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1310
Co-authored-by: Lunny Xiao <[email protected]>

internal/pkg/report/reporter_test.go

@@ -309,7 +309,10 @@ func TestReporter_LogLevelFiltering(t *testing.T) {
 	taskCtx, err := structpb.NewStruct(map[string]any{})
 	require.NoError(t, err)
 	cfg, _ := config.LoadDefault("")
+	cfg.Runner.LogReportLevel = "warn"
 	reporter := NewReporter(ctx, cancel, client, &runnerv1.Task{Context: taskCtx}, cfg)
+	assert.False(t, reporter.shouldAppendLogRow(logging.Record{Level: logging.LevelInfo}))
+	assert.True(t, reporter.shouldAppendLogRow(logging.Record{Level: logging.LevelWarn}))
 	reporter.RunDaemon()
 	defer func() {
 		require.NoError(t, reporter.Close(""))